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build(ui): migrate to React 19 and Primer React 38 #3383

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Merged
SamMorrowDrums merged 3 commits into from
Oct 2, 2026
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build(ui): migrate to React 19 and Primer React 38 #3383

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f36ddee
build(ui): migrate to React 19 and Primer React 38
SamMorrowDrums Oct 2, 2026
ad936a1
fix(ui): use CSS token for reviewer label backgrounds
SamMorrowDrums Oct 2, 2026
ba4f6ef
chore: merge main into React and Primer migration
SamMorrowDrums Oct 2, 2026
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8 changes: 8 additions & 0 deletions CONTRIBUTING.md
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Expand Up @@ -40,6 +40,14 @@ Type checking uses the native TypeScript 7 compiler through `tsc`; Vite handles
transpilation and bundling separately. No TypeScript compiler API integration,
typescript-eslint, or ts-node is required.

### MCP Apps UI

The `ui/` views use React 19 and Primer React 38. With Node.js 20.19+ or 22.12+, run `cd ui && npm ci && npm run typecheck && npm run build && npm audit` before `script/test`. The build writes self-contained HTML to `pkg/github/ui_dist/`, which the Go server embeds; these generated files are not committed.

Primer 38 no longer exports `Box` or accepts `sx`/styled-system props. Use semantic HTML, native `style` props for dynamic/layout styles, and CSS Modules for nested selectors. `AppProvider` loads Primer's primitive tokens and light/dark themes, so use CSS variables rather than JavaScript theme values. Custom element typings must augment `react/jsx-runtime` rather than the global `JSX` namespace.

For UI dependency upgrades, compare all four views (`get-me`, `issue-write`, `pr-write`, and `pr-edit`) in light/dark themes and at narrow widths in an MCP Apps host, including menus, Markdown editing/preview, and completed-result views. Include before/after screenshots in the pull request.

## Submitting a pull request

1. [Fork][fork] and clone the repository
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